POST HOC ERGO PROPTER HOC:
the logical FALLACY which assumes that because "A"
if it precedes or is the antecedent of "B" it causes "B." For example:
someone who eats ice cream and then claims that the ice cream caused their headache has
committed this fallacy. The ice cream may or may not have caused the headache but the
observation that it preceded the headache does not prove that it caused it. Further
investigation and evidence is needed to discover the true CAUSE which could be an allergic
reaction to ice cream but not necessarily.
